Perpetual calendar



Jan. 9, 1951 B. R. NoNo 2,537,693

PERPETUAL CALENDAR Filed Dec. 5, 1947 6 7 luren/ln' :Enaalln FR.- Nunn rPatented `lan. 9, 195i UNITE-D STATES sATsNr OFFICE 2,537,693 PERPETUAL CALENDAR Basilio R. Nono, Cuyapo, P. I.

Application December 5, 194,7, Serial N o. 789,797

- 1 Claim. l

This invention relates to a perpetual calendar of extremely simple construction which is very small and compact and relatively light in weight so that it can be conveniently carried in the pocket.

Still another object of the invention is to provide a perpetual calendar which is extremely durable land may be formed of various materials such as steel, ivory or Celluloid or combinations of materials.

-Stillanother object of the invention is to provide a calendar` structure which is very simple to employ and capable of being utilized for all months and all years and vthrough the use of which a date may be found -a certain number of days in the past or future or by means of which the day of the week of any date past or future may be readily ascertained. y

Still a further object of the invention is to provide a calendar for use by pupils, students, professional and business men, in offices and elsewhere.

Various other objects and advantages of the invention will hereinafter become more fully apparent from the kfollowing .description of the f drawing, illustrating a preferred embodiment thereof, and wherein: v

Figure 1 is a plan view looking toward one side of the calendar;

Figure 2 is a similar view looking toward the opposite side thereof, and s i Figure 3 is a diametral sectional view taken substantially along a plane as indicated by the line 3--3 of Figure 1.

Referring more specifically to the drawing, the perpetual calendar, constituting the invention is designated generally-5 and comprises a disk including a central disk-like section 6, an intermeydiate annular section 7 and an outer annular section 8. The periphery of the inner section i5 is provided with a groove S for slidably receiving an annular tongue I0 which projects inwardly from the interior of the intermediate section 'l and the periphery of said intermediate section 'l is likewise provided with an annular groove H for slidably receiving a similar annular tongue I2 formed on the interior of the outer annular section 8, so that the sections 6, 'l and 8 are relatively rotatable. The annular tongues may be engaged in the annular grooves in any suitable manner. For example, if the parts are formed of a material possessing sufficient flexibility or resiliency, this can be accomplished by bowing the inner element so that its peripheral groove will be reduced enough in diameter to receive the tonguevof the element to be disposed immediately therearound and thereafter flattening the inner element, or if the parts are not sufficiently flexible or resilient for assembly in this manner, one flange of each groove may be bent outwardly to allow insertion of the tongue of the element to be disposed immediately therearound and said flange thereafter bent inwardly.

Figure l illustrates one face, designated generally A, the outer portion of which, formed by the section 8 constitutes a day plate i3, the intermediate portion of which, formed by the section 'l constitutes a date plate I4 and the inner portion of which, formed by the disk section 6 constitutes a month plate l5. The opposite side or z face B of the calendar 5, illustrated in Figure 2, includes an outer plate I6, formed by the section '8, an intermediate plate I7, formed by the section l' and an inner plate I8 formed by the section 6.

The outer plate i6 of the face B contains a ring of numbers I9 extending therearound and inwardly thereof contains another ring composed of four numbers, designated 2i! and known as the remainder ring.

The intermediate plate l1 of the face B has suitably inscribed thereon an outer ring of numerals, designated generally 2! numbered consecutively clockwise from the top thereof from l to 28 and asecond intermediate ring 22 of numerals of four sets each including the numerals from Zero to six in a clockwise direction; and an inner ring 23 of letters extending therearound and reading as follows: S-M-T-W-T-F- S-SM-T-W-T-F-S-S-M-T-W-LT-F-S-S-M-T- W-T-F-S reading clockwise from the top thereof and constituting the day row with the initials indicating the days of the week. The inner plate IB of the face B includes an outer row of numerals 24 extending clockwise therearound andincluding the numerals from l to 28, and beginning at the top thereof, arsecond row 25 beginning at the top thereof with the numeral 27 and diminishing to the numeral l Which is followed by the numeral 28. Within the ring of numerals 25 is a month row 26 including the initial letters of the twelve months of the year beginning with the initial J for January lat the top center thereof and reading clockwise and there within is contained a ring of numerals one of which aligns wtiheach of the letters of the month and indicating the number of days therein, as indicated `at 2. It will be noted that the letter F designating February has the numerals 28 and 29 aligned therewith radially for indicating 29 days therein during leap years.

The side or face A has the outer section I3 thereof provided with a ring of letters, designated 2S representing the initials of the days of the week and beginning with a T at the top thereof, representing Thursday and including 31 equally spaced letters and outwardly thereof has a partial ring 29 including the letters T-F-S-S- M-T-W reading clockwise representing the days of the week beginning with Thursday and with the letter SX1 representing Sunday rbeing disposed at the top center thereof and radially aligned with the top center letter T of the ring 28, representing Thursday. The intermediate face I4 of the face A is provided with a ringoi numerals 3Q including the numerals from l to 3l in rotation clockwise therearound andthe inner section I5 contains indicia SI representing the abbreviations of the twelve months of the year and inwardly thereof a ring of spaced numerals 1552i corresponding to the ring 2l and representing tfienumber of days inthefninth.

Thel use of the face A of the yperpetual calendar Eis believed obvious. y

"For example -as vthe fiabe is set in Figure l the calendar is for use for the month of January with the rst'd'ay 5i th month falling on Thursday and the ,ring 92% 'may 1'be utilized with the ring Si for indicating the'day of the Adate of the we'elup to 'and'thrugh Wednesday the 28thand thereafter the outer ringf 'is used to indica-te that the 29th, 30th; and 31st of January fall on Thursday, 1lirda-y and Saturday. The Vproper month can be aligned withftlie top center ofthe outer disk "8 and by turning the intermediate disk i the proper month canbea-ligned with aletter of 'the ring ZS located adjacent the top thereof representing ythe first day of the week of said innth after which thefintrmediate annular sed-Y tion can be rotated `to align the numeral 1 of the ringer indicia 36 Ywith 'said months 'and day and in'tliis -nanner the 'calendar caribe adjusted perpetually. y

ithei of the rings of indicia Z'I'or 3'2 may be utilized for quickly recalling the numberof days in any particular mont-hand for duieily ascertaining tlie'nninberof days in any/given number 'of vinon or between anytwo given'dateso'r the dateof a'day a, certain number'fdayssubsedueiit or prior to 'given'date. t

The ace of the "calendar may valso be 'utilized for ascertaining the day 'of Avthe weeka er-g tain number fof days prior or subsequent tb a given day. For enample', if itis desired te the day of the wek 100 days -prior 'to ajcert'ain rlfueeday, by dividing 100 by 7 a remainder of 2 will be obtained meaning that i0() days before Tuesday is '2 days beforeTues'day. By placing the numeral l in radial alignment with 'the T of me' indicia ring l28 'and then moving said nuner'al l of the indicia ring Sd'counterclocl; wise twospaices, it will be readily apparent that the numeral 1 will align with the S, repr'esentin'g Sunday.

The face plate B is employed for nding the day of a certain past or future date with the corresponding year. This is accomplished by firstvascertaningrthe diierence of theyears,'then dividing the smaller year by four and obtaining the remainder. The numeral 28 of the ring 2i is then placed below a number in the remainder row 2G which is equal to said remainder.` 'A number is then found in the row 2l which is equal to the dierence of the years andthe number in the radially aligned ring of indicia i9, cone stituting the year row, represents the number desired. If the difference of the years isgreater 4 than 28, said difference is rst divided by 28 and the resulting remainder is then employed as previously described. By placing a number 28 of the number ring 24 below a number of the ring 22 which is equal to the number just previously found in the year row and by finding a number in the ring 24 which is equal to the number of the present month, if the problem involves a past date; oi is equa; to die1 number' 'or th future month, if the problem involves a future date, then the answer is the number in the rOW 22 which aligns therewith, or if a, leap year employ tlieiiiirnber in the right half of the face B rather than ,in athe left half thereof. By setting the `riiiiiib'er- '23'bf the ring 24 below a number of the ring V22 whichis equal t0 the number just found in said number ring 22 and by finding a number in the ring 24 equal to the present date, if the problem involves a past date, or equal tothe futur'edate, if thefprobl'eni"hivlves'fture date, to ascertain the A'riun'ibeifin the 1row '22 'lcat in alignment therewith or, if the `date is Emore than :28, subtract 28` from said number td'o'b'tain a remainder` and iind a number in the dwl equal to said yr'eifriaindeig and in 'radiali ignii'i'ent th'erewitliV 'the Vnumber in 'the rw or 22'. y The number 28"oi theriiig'25 isset'b'elw lanurnber of the ring 22 'qual't'the nrnberfiist found in4 sam ring 22. n number is their muuu in the ringi 'e'qiial'to vthe number Aof `tli-fi'ast month, 'if 'the problem :iiolve's afp'ast date; or isediial Ato the number of the 'prfeset mn-th; "if the'probieiuinvowes a'futuiejdatefaa-thef nil bei "in the ring22 in radial 'aligiiineiit'ther'witli is obtained. It "a leap' year, 'the :iirbnf 'the month is indicated 'on the Vring'l'i'al 'offtheaceBr By setting the number 2er-of fmeimuicia ring 25 in radial Valignment 4'with 'the liiiinber Ain fthe number Vriri`g22; ju's't previously found; and thereafter iindiiigV a number in` the fifi-g 25 'equal-to the past date, if the problem involves a pastidat'e, bi""equalftoV the present dat'efif thproble 1nvl'vesa future dated-nd ascertaining thefiiibr in 'the riiig '22 whichfaligns' therewith, 'or if "the date is' more `thai/ra by sub ting 28l`th`r-j from to obtaina remainderjit 1s psibleto find a number 'in the ring "ze 1t/munis equal to plus remainder for obtaining a number fthle 'ring 22 which is 'in radial 'a'ligni'n'e'rtl therewith. The number 28 oi the indicia fing `25,^if fthe .prob lem 'involves a past dater 'or -in `ri-1ig24, if Ythe problem yinvolves a-'futur'e date, i's set below vthe present day of the day ring 23 vafter which 'a number in the indicia -ring V25 or indicia'ring 24, respectively, is found which is equal to th'e'number just found win the numberringj, and ttli'e aligned indicia vof the ring i23 provi-des -thes'olltion, that is, the desired day `of the week.A

For example, if it'i-syesiied to lund the dayof the week of January 19, l9l6`jon adai/such'as for example, Wednesday, vDecember 275, 1946,'igt can be readily ascertained that the `diierence of theyears is`30. -By then dividing the smaller year; ,1915 by four, a remainderprzero is obtained. By setting the number 2:15. below the zero of the indicia row 2li and by dividing the'diierence ofV the years, which is 30, bly/281, the-remainder` of 2 is obtained. a l:4t-nove theA "2 in therow A is the number e of the row i9. By setting the nume ber 28 o f the ring- `below the number 4 of the vring 22 and as l946 is a leapyear, the-number "6 in the ring 24 is `found which 'is the -number of thepresent month and inalignment there; with in the number row 2 2 l'is the number 31. By setting the number "28" ofthe Vring -24 infradal alignment with the number 3 of the ring 22, Which is the number just found in said ring 22, and by nding the present date 25, in the ring 24 We obtain the number 9 in the ring 22. The number 28 oi ring is set below the 0 of the ring 22. The year 1916 is a leap year. By inding the 0 in the roy.7 or ring 25, which is the number of 'the past month, in radial alignment therewith is the 9 in the ring 22. By setting the number of the ring 25 below the "0 of the ring 22, the n ber 19 is found in the ring Various modioations and changes are con-1 templated and may obviously be resorted to, without departing from the spirit or scope o the invention as hereinafter defined by the appended claims.

I claim as my invention.

A perpetualcalendar comprising a disk composed solely of an inner disk. section, an outer annular section and an intermediate annular section interposed between said inner disk section and said outer annular section, said sections being of uniform thickness and having tongue and groove means rotatably connecting the sections to one another, one side of the disk seetion containing indicia representing the months 6 of the year and the number of days in each month, a corresponding side of the intermediate annular section containing numerals representing the maximum number of days of any month, and the corresponding side of the outer annular section containing initials indicating the days of the week, the indicia of each of said sections being circumferentially arranged whereby the indicia of said corresponding sides of the seotions may be correlated by rotating the sections relatively to one another for visually indicating the number of days in any month and the date of each day of the week in any month of any year.

BASILIO R. NO-NO'.

REFERENCES CITED The following references are of record in the nie of this patent:

UNITED STATES PATENTS Number Name Date 156,391 Thorp Oct. 27, 1874 309,271 Welch Dec. 16, 1884 330,038 McCarthy Nov. 10, 1885 648,835 Biggs May 1, 19010 658,028 SteigerY Sept. 18, 1900 683,433 Biggs Oct. 1, 1901 709,353 Norman Sept. 16, 1902 784,974 Biggs May 14, 1905 FOREIGN PATENTS Number Country Date 30,297 Australia Nov. 12, 1931 

